NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005




Synonyms & Trade Names

Acetic aldehyde, Ethanal, Ethyl aldehyde
DOT ID & Guide

1089 / 129


NIOSH REL: Ca See Appendix A See Appendix C (Aldehydes)
OSHA PEL: TWA 200 ppm (360 mg/m3)
Ca [2000 ppm] See: 75070
1 ppm = 1.80 mg/m3
Physical Description
Colorless liquid or gas (above 69°F) with a pungent, fruity odor.
MW: 44.1
BP: 69°F
FRZ: -190°F
Sol: Miscible
VP: 740 mmHg
IP: 10.22 eV

Sp.Gr: 0.79
Fl.P: -36°F
UEL: 60%
LEL: 4.0%

Class IA Flammable Liquid: Fl.P. below 73F and BP below 100F.
Incompatibilities & Reactivities

Strong oxidizers, acids, bases, alcohols, ammonia & amines, phenols, ketones, HCN, H2S [Note: Prolonged contact with air may cause formation of peroxides that may explode and burst containers; easily undergoes polymerization.]
Measurement Methods
NIOSH 2018, 2538, 3507; OSHA 68
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet (flammable)
Change: No recommendation
Provide: Eyewash, Quick drench
First Aid
(See procedures)
Eye: Irrigate immediately
Skin: Water flush promptly
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations
At concentrations above the NIOSH REL, or where there is no REL, at any detectable concentration:
(APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister/Any appropriate escape-type, self-contained breathing apparatus
Important additional information about respirator selection
Exposure Routes
inhalation, ingestion, skin and/or eye contact
Irritation eyes, nose, throat; eye, skin burns; dermatitis; conjunctivitis; cough; central nervous system depression; delayed pulmonary edema; in animals: kidney, reproductive, teratogenic effects; [potential occupational carcinogen]
Target Organs
Eyes, skin, respiratory system, kidneys, central nervous system, reproductive system

Cancer Site
[in animals: nasal cancer]
See also: INTRODUCTION   See ICSC CARD: 0009   See MEDICAL TESTS: 0001